get checkout - submit url params to php function

checkout.js

async function getCheckoutUrl() {
  try {
    // Get URL params
    const params = new URLSearchParams(window.location.search);

    // Make the request to the PHP function
    const response = await fetch("/php/get_checkout_url.php", {
      method: "POST",
      body: JSON.stringify(Object.fromEntries(params)),
      headers: {
        "Content-Type": "application/json",
      },
    });

    // Check for successful response
    if (!response.ok) {
      throw new Error("Error getting checkout URL");
    }

    // Get the checkout URL from the response
    const checkoutUrl = await response.text();

    // Redirect to the checkout URL
    window.location.href = checkoutUrl;
  } catch (error) {
    // Redirect to the error page
    window.location.href = "/error.html";
  }
}

// Call the function
getCheckoutUrl();